2. A hypocrite in general.
3. (verb) Commit an act of severe hypocrisy.
Derived from the name of a famous politician who wants to ban all privately owned guns while they have a concealed weapon permit in a place where getting one is almost impossible.
She's Feinsteined us again, that wicked lady!
That Matisyahu sucks so bad, it makes me want to beat up a feinstein.
Stop talking during the movie you feinstein motherfucker.
Ow feinstein! Your nose just poked me in the eye!